Welcome to TSG
What is it you are actually asking please
can the ethernet cable run from the router to your computer - if so that is how to do it.
If not you will have to use some manner of conveying the signal from the router/modem to your computer
eg - on the mains wiring - although that is possibly likely to interference
In respect of wireless there is absolutely no need to even consider a card inside the computer a USB wireless adpater will work just as well and in many cases better than an internal card
What is it you are actually asking please
can the ethernet cable run from the router to your computer - if so that is how to do it.
If not you will have to use some manner of conveying the signal from the router/modem to your computer
eg - on the mains wiring - although that is possibly likely to interference
In respect of wireless there is absolutely no need to even consider a card inside the computer a USB wireless adpater will work just as well and in many cases better than an internal card